Unirse a la base en múltiples y condiciones

var query = from t1 in context.table1
            join t2 in context.table2 on new {t1.fieldA, t1.fieldB} equals new {t2.fieldA, t2.fieldB}
            join t3 in context.table3 on t3.fieldA equals t3.fieldC
            where 
                t1.Enabled == 1 && t2.Active == 1 && t3.Linked == 1 ...
Red Team